System for exchanging blood ultrafiltrate

Claim 1

ULTRAFILTRAATION APPARATUS COMPRISING HOUSING MEANS PROVIDING A PLURALITY OF FILTERING SECTIONS EACH DEFINING A CLOSED CHAMBER, A DISC-SHAPED IMPELLER HAVING AN UPPER AND A LOWER SURFACE AND ROTATABLY MOUNTED IN EACH CHAMBER AND DEFINING A PLURALITY OF SPIRAL CHANNELS EXTENDING OUTWARDLY FROM THE CENTER TO THE PARIPHERY THEREOF, EACH CHANNEL ALTER-8 NATELY COMMUNICATING WITH THE SPACE ABOVE AND BELOW ITS ASSOCIATED CHANNEL FOR COMMUNICATING A FLUID THEREIN ALTER NATELY WITH THE UPPER AND LOWER SIDES THEREOF AT A PLURALITY OF LOCATIONS SPACED PROGRESSIVELY ALONG SAID CHANNEL: FIRST AND SECOND FILTERING MEMBRANES FOR RACH CHAMBER AND MOUNTED RESPECTIVELY ABOVE AND BELOW AN ASSOCIATED IMPELLER, FIRST CONDUIT MEANS ASSOCIATED WITH EACH CHAMBER FOR COPLING A FLUID TO BE PROCESSED TO THE CENTER OF ITS ASSOCIATED IMPELLER AND INTO SAID CHANNELS, SECOND CONDUIT MEANS FOR EACH CHAMBER COMMUNICATING WITH SAID CHAMBER AT LOCATIONS ABOVE SAID UPPER MEMBRANE AND BELOW SAID LOWER MEMBRANE FOR COLLECTING FLUID PASSING THROUGH SAID MEMBRANES AND FOR RETURNING SAID FILTRATE, THIRD CONDUIT MEANS FOR EACH CHAMBER AND COMMUNICATING WITHE SPACE BETWEEN SAID MEMBRANES FOR COLLECTING THE FILTRAND, AND POWERED MEANS FOR ROTATING SAID IMPELLERS, WHEREBY AS SAID IMPELLERS ARE ROTATED, THE FLUID TO BE PROCESSED PASSES THROUGH SAID FIRST CONDUIT MEANS OF EACH FILTER SECTION, ENTERS THE CENTER PORTION OF SAID IMPELLERS, PASSES THROGH SAID CHANNELS UNDER CENTRIFUGAL FORCE ALTERNATELY CONTACTING SAID FIRST AND SECOND FILTER MEANS AT A PLURAITY OF PROGRESSIVELY OUTWARDLY SPACED LOCATIONS SURING SAID PASSAGE, AND THE FILTRATE IS COLLECTED BY SAID SECOND CONDUIT MEANS WHEREAS THE FILTER AND IS PASSED TO SAID THIRD CONDUIT MEANS.